You do not remember correctly.
The immortal/undying titles were turned into Feats of Strength and the mount rewards for the respective meta achievements were removed with the launch of t8.

Nope. Only mounts got removed at the start of T8. The achievements/titles remained till the very end of Wrath. Then you could just lolfaceroll them with smaller group (less risk of failure) fully decked in ICC gear.

Sure you could claim "I only consider the original ones with the mount", but exactly the same can be said about Herald of the Titans, Scarab Lord, Hand of A'dal, Champion of the Naaru, and many other.

The Argent Defender, on the other hand, is an example of a truly prestigious title without any conditions. You could not cheat it or make significantly easier by any way at any point of the expansion, and it got removed very quickly. And it was hard.

Nope. Only mounts got removed at the start of T8. The achievements/titles remained till the very end of Wrath. Then you could just lolfaceroll them with smaller group (less risk of failure) fully decked in ICC gear.

lost most of its prestigiousness when everyone and there mother could get it with the new realms. there are alot rarer titles then that.

a lot rarer? it's very, very rare that anyone else would complete their quest within the time window after the first person obtains Scarab Lord, so it's realistic to say it's practically one person per server. also, the title was available very early in the games life cycle, and although new realms have affected that fact, it still remains true that people playing in 2006 are way less likely to be playing WoW now than more recent subscribers, so I honestly can't agree that there are 'a lot rarer' titles than Scarab Lord.

-in 5 man dungeons, Arms Warriors again are the weakest link in the chain as they require 3X amount of healing as other classes and therefore die much more frequently and receive less healing in general, as with the amount of mana spent to keep an Arms Warrior alive the healer can heal all other members and himself.

a lot rarer? it's very, very rare that anyone else would complete their quest within the time window after the first person obtains Scarab Lord, so it's realistic to say it's practically one person per server. also, the title was available very early in the games life cycle, and although new realms have affected that fact, it still remains true that people playing in 2006 are way less likely to be playing WoW now than more recent subscribers, so I honestly can't agree that there are 'a lot rarer' titles than Scarab Lord.

If I remember right when i started playing ('08) there were some new server's that came up and you could transfer to the new server, finish up your scarab lord quest line (which you had obviously started already) and transfer back to your old realm after a couple days with the Scarab lord title.

If I remember right when i started playing ('08) there were some new server's that came up and you could transfer to the new server, finish up your scarab lord quest line (which you had obviously started already) and transfer back to your old realm after a couple days with the Scarab lord title.

You still see a LOT less Scarab Lords running around today than people with "Death's Demise", "The Undying", "Conqueror of Ulduar" etc.

Scarab Lord definitely the most rare and most prestigious of all the titles out there.

Well this is sort of debatable. It's prestigious, sure, but not many people even had the chance to get it in the first place, only people who played in Vanilla AND had a decent guild AND were chosen to get the quest, have it. Honestly, I just go like "meh" whenever I see someone riding on the scarab mount or has the Scarab Lord title.

OT: From a PvE aspect, the most prestigious title(s) for me would be Realm's Firsts such as Death's Demise, Grand Crusader, Celestial Defender because those were the ones that showed true skill (perhaps not Death's Demise as it was repeatable whereas the other 2 weren't but it was still really hard)...Too bad they removed such titles and the feats of strength associated with them; which do pop up in chat if you get them but you don't get them for some reason. They really made the server first race very competitive IMO.

Most prestigious I have would be Grand Crusader as it's the only one of those 3 I have. Firelord and Dragonslayer were also pretty beast for a while and I wore them proudly.

Mine, Storm's End world 2, 10 man Grp(obviously doesnt show it was that fast) And some realm firsts.
Overall: Realm First titles from Wotlk, Argent defender, Gladiators, Scarab Lord and attunementtitles from TBC.